Restructuring Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	$ 0	$ 1,903
Restructuring Reserve [Roll Forward]
Beginning balance	0
Charges	2,168
Cash Payments	(221)
Change in Estimates	(44)
Ending balance	1,903
Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	0	722
Remaining additional expenses expected to be accrued		100
Restructuring Reserve [Roll Forward]
Beginning balance	0
Charges	987
Cash Payments	(221)
Change in Estimates	(44)
Ending balance	722
Lease termination
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	0	1,181
Restructuring Reserve [Roll Forward]
Beginning balance	0
Charges	1,181
Cash Payments	0
Change in Estimates	0
Ending balance	1,181
ES | Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	700	700
Restructuring Reserve [Roll Forward]
Ending balance	700
SS | Severance benefits and loss on early exit from leases
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	1,200	$ 1,200
Restructuring Reserve [Roll Forward]
Ending balance	$ 1,200